He made a weak attempt to look cheerful.

　　他有氣無(wú)力地擺出高興的樣子。

　　You're not your usual cheerful self today.

　　你今天不像往常那么快快樂(lè )樂(lè )的。

　　He felt bright and cheerful and full of energy.

　　他感到興高采烈，渾身充滿(mǎn)活力。